<?php
$go='去';
$good='好的';
echo "go的意思是:$go\n";
echo "good的意思是:$good\n";
echo "good的意思是:{$go}od\n";
echo "good是:“{$good}”的意思\n";
$a=[91, 'php'=>98, 'age'=>18];
echo "a[0]=$a[0]\n";
echo "a['php']=$a[php]\n";
echo "a['gae']={$a['age']}\n";